Hello, People, I am getting more and more familiar with Wihu, but now i encountered a problem i cannot explain. Please review the following: Wihu is called from Winnt.sif/guirunonce. Install.ini has some lines  description.3=Codecs command.3=cmd /c %systemdrive%\install\codecs.cmd selected.3 = 1 Codecs.cmd looks like: set dir=%systemdrive%\install rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %dir%\mp3\fhg.inf Fhg.inf is looking like this: [Version]  Signature   = "$Chicago$"  AdvancedINF = 2.5, "Your setup subsystem is outdated.  Please install IE 3.01 or greater."   [DefaultInstall] RequiredEngine=Setupapi CopyFiles  = CopyFiles.DLL, CopyINF RegisterOCXs     = OCX.Register AddReg = AddReg  [DestinationDirs]  CopyFiles.DLL        = 11   CopyINF    = 17   [AddReg]  HKLM, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\drivers.desc", "l3codecp.acm",, "Fraunhofer IIS MPEG Layer-3 Codec (Professional)" HKLM, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\drivers32", "msacm.l3codec",, "l3codecp.acm"  [OCX.Register]  "%11%\l3codecp.acm"    [CopyFiles.DLL]  l3codecp.acm,,,97     [CopyINF]  fhg.inf Now there's a significant difference in the behaviour of the Inf-File: In manual installation (right click -> install) it all works well. Wenn called from wihu, everything in the '%systemdrive%\install'-Directory gets deleted. What is happening here ?